linux-kernel - RE: [PATCH v3 1/2] usb: dwc2: gadget: sparse warning of context imbalance

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Date:	Fri, 17 Oct 2014 18:50:19 +0000
From:	Paul Zimmerman <Paul.Zimmerman@...opsys.com>
To:	Sudip Mukherjee <sudipm.mukherjee@...il.com>,
	"balbi@...com" <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v3 1/2] usb: dwc2: gadget: sparse warning of context
 imbalance

> From: Sudip Mukherjee [mailto:sudipm.mukherjee@...il.com]
> Sent: Thursday, October 16, 2014 9:44 PM
> 
> sparse was giving the following warning:
>         warning: context imbalance in 's3c_hsotg_ep_enable'
> 	                - different lock contexts for basic block
> 
> we were returning ENOMEM while still holding the spinlock.
> The sparse warning was fixed by releasing the spinlock before return.
> 
> Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
> ---
>  drivers/usb/dwc2/gadget.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
> index 7b5856f..7f25527 100644
> --- a/drivers/usb/dwc2/gadget.c
> +++ b/drivers/usb/dwc2/gadget.c
> @@ -2561,8 +2561,10 @@ static int s3c_hsotg_ep_enable(struct usb_ep *ep,
>  			hs_ep->fifo_size = val;
>  			break;
>  		}
> -		if (i == 8)
> -			return -ENOMEM;
> +		if (i == 8) {
> +			ret = -ENOMEM;
> +			goto error;
> +		}
>  	}
> 
>  	/* for non control endpoints, set PID to D0 */
> @@ -2579,6 +2581,7 @@ static int s3c_hsotg_ep_enable(struct usb_ep *ep,
>  	/* enable the endpoint interrupt */
>  	s3c_hsotg_ctrl_epint(hsotg, index, dir_in, 1);
> 
> +error:
>  	spin_unlock_irqrestore(&hsotg->lock, flags);
>  	return ret;
>  }

Acked-by: Paul Zimmerman <paulz@...opsys.com>

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